Conductive paste for solar cell electrode and solar cell manufactured using same

Abstract

The present invention relates to a conductive paste for a solar cell electrode, including a metal powder, a glass frit and an organic vehicle, wherein the metal powder includes a metal powder having a sintering shrinkage rate of 15 to 30%, whereby the light-receiving area of the front electrode of a solar cell formed using the conductive paste including the metal powder having an increased sintering shrinkage rate can be enlarged and short-circuit current (Isc) can be increased, thus increasing the power generation efficiency of the solar cell.

1 . A conductive paste for a solar cell electrode, comprising a metal powder, a glass frit, and an organic vehicle,
 wherein the metal powder includes a metal powder having a shrinkage rate of 15 to 30%, measured as an area reduction rate after applying, drying and firing the paste including the metal powder, compared to before firing.   
     
     
         2 . The conductive paste of  claim 1 , wherein the metal powder includes a first metal powder having a sintering shrinkage rate of 15 to 20%. 
     
     
         3 . The conductive paste of  claim 1 , wherein the metal powder includes a second metal powder having a sintering shrinkage rate of 20 to 25%. 
     
     
         4 . The conductive paste of  claim 1 , wherein the metal powder includes a third metal powder having a sintering shrinkage rate of 25 to 30%. 
     
     
         5 . The conductive paste of  claim 1 , wherein the metal powder includes at least two metal powders selected from the group consisting of a first metal powder having a sintering shrinkage rate of 15 to 20%, a second metal powder having a sintering shrinkage rate of 20 to 25%, and a third metal powder having a sintering shrinkage rate of 25 to 30%. 
     
     
         6 . The conductive paste of  claim 5 , wherein the metal powder is configured such that an amount of the metal powder having a relatively high shrinkage rate is greater than an amount of the metal powder having a relatively low shrinkage rate. 
     
     
         7 . The conductive paste of  claim 1 , wherein the metal powder has an average particle diameter (D50) of 0.5 to 5 μm. 
     
     
         8 . A solar cell, comprising a front electrode provided on a substrate and a rear electrode provided under the substrate,
 wherein the front electrode is manufactured by applying, drying and firing the conductive paste of  claim 1 .